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Chapter 21

TermDefinition
Biosphere The parts of Earth and the surrounding atmosphere where there is life
Community All the populations living in an ecosystem at the same time
Population All the organisms of the same species that live in the same area at the same time
Competition The demand for resources,such as food,water and shelter, in short supply in a community
Limiting Factor A factor that can limit the growth of a population
population density The size of a population compared to the amount of space avaliable
Biotic potential The potential growth of a population if it could grow in perfect conditions with no limiting factors
Carrying capacity The largest number of individuals of one species that an ecosystem can support over time.
Birthrate The number of offspring produced by a population over a given time period
deathrate The number of indivuduals in a population that die over a given time period.
extinct species A species that has died out and no individuals are left
endangered species A species whose population is at risk of extinction
threatened species A species at risk, but not yet endangered
migration The instinctive, seasonal movement of a population of organisms from one place to another
Habitiat The place within an ecosystem where an organism lives; provides the biotic and abiotic factors an organism needs to survive and reproduce
niche The way a species interacts with abiotic and biotic factors to obtain food, find shelter, and fulfill other needs.
producer An organism that uses an outside energy source, such as the sun, and produces its own food
consumer An organism that cannot make its own food and gets energy by eating other organisms.
symbiosis A close, long term relationship between two species that usually involves an exchange of food or energy.
mutualism A symbiotic relationship in which both organisms benifits
parasitism a symbiotic relationship in which one organism benefits and the other is harmed
Created by: InaayaQ
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